A still taken on on July 1, 2012 from a video shows Islamist militants destroying an ancient shrine in Timbuktu. Mali Islamists occupying the city of Timbuktu, north-west of Mali, are destroying more mausoleums announced an Islamist chief in the city on December 23, 2012. AFP PHOTO AFP PHOTO.

BAMAKO (AFP).- Armed groups occupying Timbuktu in northern Mali used pickaxes on Sunday to smash up any remaining mausoleums in the ancient city, an Islamist leader said.

The rebels' ruthless implementation of their version of Islamic law comes just days after the United Nations approved a military force to wrest back control of the conflict-ridden area.

"Not a single mausoleum will remain in Timbuktu, Allah doesn't like it," Ansar Dine leader Abou Dardar told AFP. "We are in the process of smashing all the hidden mausoleums in the area."

Witnesses confirmed the claims and one resident, who said he belongs to Al-Qaeda in the Islamic Maghreb (AQIM), another militant group occupying the city since a March coup plunged the west African state into chaos.

Anything that doesn't fall under Islam "is not good. Man should only worship Allah," Mohamed Alfoul said of the mausoleums, which the armed Islamists consider blasphemous.

The vandalism of the Muslim saints' tombs in the UNESCO World Heritage site came a day after other Islamists in the northern city of Gao announced they had amputated two people's hands.

The continued strict application of sharia law is seen as a sign that the armed Islamist groups are unfazed by the UN's green light for the African-led military operation.

Planners have said any intervention cannot be launched before September next year. French Defence Minister Jean-Yves Le Drian however told Monday's edition of La Croix newspaper that he thought it could be launched in the first half of 2013.

In July, Islamists destroyed the entrance to a 15th-century mosque in Timbuktu, the so-called "City of 333 Saints."

"The Islamists are currently in the process of destroying all the mausoleums in the area with pickaxes," one witness said.

"I saw Islamists get out of a car near the historic mosque of Timbuktu. They smashed a mausoleum behind a house shouting 'Allah is great, Allah is great'," another resident told AFP.

As well as in cemeteries and mosques, the revered mausoleums are found in alleyways and private residences of the city, an ancient centre of learning and a desert crossroads.

A statement from her office said she was "deeply shocked by the brutal destruction of mausoleums and holy shrines in Timbuktu...

"Their destruction is a tragedy not only for the people of Mali, but for the whole world."

Ansar Dine began destroying the cultural treasures in July.

The International Criminal Court warned their vandalism was a war crime, but the Islamists followed up with more damage in October, when they smashed several Muslim saints' tombs, prompting another international outcry.

The latest vandalism comes a day after another Islamist group in northern Mali -- the Movement for Oneness and Jihad in West Africa (MUJAO) -- said it had carried out amputations on two accused robbers in the northern city of Gao, and warned of more to come.

He said Saturday: "The international community needs to know that it is its hesitation over intervening, or no, in northern Mali that is encouraging the Islamists to show they are at home and are not afraid of anything."

On Thursday, the United Nations decided to back the 3,300-troop operation to take back the Islamist-held region, though the Security Council vowed to keep working towards a peaceful solution.

Once considered one of Africa's most stable democracies, Mali has for months been mired in the northern conflict that has so far displaced more than 400,000 people, according to the United Nations.

Meanwhile in Nigeria on Sunday, radical Islamist group Ansaru claimed last week's kidnapping of a French citizen in the north of that country. One reason he was targetted, said the group, was because of France's push for military intervention in northern Mali.